Apparatus for the manufacture of patterns for pressing molds and stamps



Sept. 9, 1930" M. GRUNE APPARATUS FOR THE MANUFACTURE OF PATTERNS FOR PRESSING HOLDS AND STAIPS Original Filed 001:. 5, 192 s 5 Sheets-Sheet 1 //7 venzan: /7=zx r'uxn e oz aragy Fly. 3.

"Spt. 9,1930. GRUNE If/75355 APPARATUS FOR THE MANUFACTURE OF PATTERNS PRESSING HOLDS AND STAIPS Original Fi led Oct. 5. 1926 a Sheets-Sheet 2 .5 Jove/25oz:

max. Crw y Sept. 9; 1930. M. GRUILJE 1,775,456

'APPARATUS FQR THE MANUFACTURE OF PATTERNS FOR PRESSING HOLDS AND STAIPS Original Filed Oct. 5, 1926 5 Sheets-Sheet 3 m me Sept. 9 19 30 j UNITED STATES PATENT OFFICE .m' sauna, or rramsaus, GERMANY FOR THE MANUFACTURE OI PATTEBNS'FOB PBESSIIQ'G HOLDS AND STAMPS 1o produ v orms fro Original application This application is a division of m co- U. S. patent application Seri No. 139,741, filed October 5, 1926, now Patent No. ,1,724,4=73. In my said original application "I have described a method of manufacturing paste-board-shoe forms or lasts according to which the lasts or forms are manufactured in a stamping machine, working with specially designed stamping molds and dies and g completely finished filling lasts or In one piece of paste-board in one hase. The stamping molds and dies used or the said purpose are cast preferably of iron, and my present invention relates to an r apparatus whereby patterns or molds may be manufactured from which the said pressing molds and dies may be cast by using the patterns for making sand molds in which the moltenironisc The apparatus preferably consists of a vertically movable ta le, carrying a casting mold op posite which is located a carrier universal ly-adjustable and capable of being secured in invention is shown diagrammatically and by adjusted position as hereafter fully described. I

An apparatus designed according to this way of example in the accompanying drawinwhieh'1 d f,d 1'

gurelis art asi eviewo an art a vertical sectibn th rough a device for a pattern, I

Figure 2 is a front view of this device Figure 3is a similar representation owing the manufacture of another part of the pattern,

Figure 4 a pnrfial plan of Figure 3, the uppermost mem rs of this figure being removed,

Figures 5-7 are special illustrations of the mold H of Figure 3 in an enlarged scale, Figures 5 and 6 being vertical sections and e 7 a'plan, V igure 8 1s a side view of a portion of the machine showing a portion thereof in section.

Referring first to Fig. 8, a is a presing or stamping table which is vertically guided be tween two vertical standards of the frame 2 of a crank ress. The bow-shaped upper part of the ame whichzis earned by the filed center 5, 1926, Serial in. 139,741, and in Germany October 0,1925. Divided and this application Med December 20, 1927. Serial No. 241,412.

wardly extending pivot 10, the projectingportion of which is threaded and carries a counter nut 12 on this thread, and the end proper of which forms a square 11 adapted to receive awrench, by which the pressure existing between the stamping members may be regulated. Y

The guide member 0-. carries two bell-crank levers d, the lower arms of which are subjected to'the pressure of springs e constantly tending to hold said levers in the position shown. The centrally a vertically shiftable pivot 7 having an enlarged head located below the ends of the upper arms of said bell-crank levers. The pivot f is normally maintained in its lowermost position by the pressure of the springs guide member a carries also e. The pivot 7 projects downwardly below k, of which 72. is provided with an upper cavity corresponding to the shape of theupper portion of the filler to be made, so that the finished filler can be removed upwardly.

The other two stamp members i and k serve to shape the lower portion of the filler, one

of them shaping the right half, the other the left half thereof. The stamp member 71. is

located in a box m and the-stamp'members 'i and I: are located in two lateral frames n and o. The members 72., i and k can be exchanged for similar members of a more or less other 'do for all stamp parts. The lateral frames n and o are guided separately by guide members p and 9 attached tothe box m, Fig. 8;

The molding or shaping parts h, k and i, as-

well as the stamp or die g may consist of any suitable material, preferably cast iron.

The manner of operation of the machine is as follows:

When the table a is in its lowermost position, a piece t of paste-board in a dry state or another suitable material andv having the suitable size and shape as requisite for the filler to be made is placed upon the mold, and the machine started. The stamp g hereby enters the shaping mold and presses the piece t into it. When the bottom of the shaping mold k contacts'with the lower end of the stamp 9 (it being understood that the piece of paste-board or the like is between the mold bottom and the stamp), the mold lifts the stamp, as well as the pivot 7 whereby the bell-crank levers d are turned. In other words: the vertical arms of these levers shift the frames n and 0 and, by the intermediary of these frames, also the mold parts is and 2' against each other so that the springs e are now compressed and the lateral rims ofthe piece t are pressed against the opposite rims of the stam 9 whereby the pressing and shaping of t e paste-board filler is finished.

This method of manufacturing the shoeforms from paste-board is claimed in my said prior application and does not form a part of the present invention. The invention relates,

bolt Y is provided with a transverse hole in which a bracket Z is inserted. This bracket and bolt may be clamped in a vertical direction by means of a bolt Y screwed through the bolt Y in such a manner that the bolts Y and Y are prevented from being shifted in an axial direction. The ball-joint may be fixed in the adjusted position by a screw Y screwed through the traverse W. Attached to the projecting lower end of the bracket Z for instance, b screws, is a wooden last A.

A vertically ad ustableand exteriorly threaded spindle 0 extends through the table U and is prohibited from being rotated by means of a bolt L screwed into a pro'ection of the table U and enga g a groove extending along the spindle The spindle, however, can be moved up and down, as required by a hand wheel B, having internal screw-thread enaging the spindle C and being prevented m axial movement by suitable means, f. i.

' N by the weight of the parts supported'by'the the shaping mold parts i and k of the last A, i. e. that portion which is to extend later on into the said shaping mold m, extends into the casting box The wooden last A is manufactured in correspondence of the original last with which the shoes for which the paste-board forms are designed are manufactured, however, its size is by so much longer than the original last as corresponds to the shrinking of the cast piece.

The last A is accurately adjusted by means of the ball-joint X and then fixed in its position by the screw Y Then the abutment nuts E are adjusted upon the standards V so that the upward movement of the table is properly limited, and now the mold'G is filled with gypsum. Those surfaces of the last A and the mold G-that come in contact with the gypsum have been previously treated in known manner in order to render easy removal of the cast piece of gypsum from the box G possible. Thereafter the plate D with the box G thereon is so much lowered by means of the hand wheel B that the mold with the gypsum therein leaves the last A. Now the box can be withdrawn from the guide. ledges F and the plate D and the patternN of the part h'of the pressing m'old shown in Figure 8 removed from the box G. From this pattern the, said mold or die part it is cast in any known manner, whereby preferably cast iron is used, e. g. by using the pattern N to make a sand mold in which the molten iron is cast.

After the casting box G has been removed from the plate D another, higher box H, Fig. 3 is shoved between the ledges F, and the plate D, is again so much lifted as to contact with the abutment nuts E. This mold H is filled with dry sand up to the shoulder J (Figs. 3, 5 and 6) and a partition wall K (Figs. 4 to 7) of thin sheet-metal is inserted above the last A that lies withinthe mold H.,

The mold portion remaining on each side of the partition wall and located above the sand is filled up with gypsum. After the moistened gypsum has hardened there are obtained two patterns 0 and p which can simply be taken off the wooden last and the box H and serve afterwards for the casting of shown in Fig. 8 from iron or the like;

The wooden last A itself serves as a pat tern for the casting of the pressing stamp g.

I claim: An apparatus for the manufacture of patterns for a pressing mold and stamp for the manufacture of forms or lasts for shoes and boots from paste-board, fibrous substance or other material capable of being stamped, comprising a Vertically adjustable table, an enlarged last above said table, a carrier adapted to carry said last, means for adjusting said carrier in all directions and for fixing it in any adjusted position, a casting box arranged on said table below the said lastand comprising a lower portion to be filled with an inert material and an upper portion adapted for casting the patterns for lateral mold members, and a partition piece adapted to be inserted into the box, forming with the upper box portion'spaces corresponding to said patterns for the lateral moldmember.

In testimony whereof I have afiixed my signature.

MAX GRU'NE. 

